Nice textures, good blend of colours & a reasonable 3D feel to the land.:encouragement:
Shessi did some european water textures that are less Pacific Blue, they're here in the Scenery mods section. IIRC he did a Summer set & a Winter set.
I think the flax fix is part of Blade's effects, also available here in the Effects section. Oldwheat did some better flak burst textures, they'll be here somewhere too.
The flak intensity is really down to the weapons & target layouts. There are lots of opinions on this, usually talking about ship flak. A quick fix for land-based flak is to just edit the mission to include more weapons. Other than that you're into dp file editing, tweaking rates of fire & tracking accuracy to get the effect that feels right for you.